class Person(object):

    def __init__(self, name, age, gender):
        self.name = name
        self.age = age
        self.gender = gender

    def say_hi(self):
        return f'你好，我是{self.name}！'

    def __str__(self):
        return f'我的名字是：{self.name}，我的年龄是：{self.age}，我的性别是：{self.gender}！'
